This is definitely the best documentation on the topic that I've seen. Getting information from TDPS is challenging to say the least! My husband and I both passed our written tests at the Angleton, Texas DPS office today, and plan to come back in January to take the driving part of the test. A couple of things we found. First, in terms of the test itself, ("What knowledge test must I take?" above ), it did cover only the material in Chapter 14 Texas Commercial Rules Test. There was no distinction made between the test I was taking and the test other CDL applicants were taking. It wasn't the CDL General Knowledge Test, or the CDL Air Brakes Test which I am thinking regular CDL applicants take in another setting. Second, although I hold a Texas REAL ID drivers license which I obtained earlier this year, I still needed to provide either a passport or birth certificate. They scanned my passport, so I may not have to do so in the future. Lastly "What is the new ITD Program?" indicates that you’ll need to complete the new Impact Texas Drivers (ITD) Program, about the dangers of distracted driving. I did complete the course, however, the Angleton TDPS office did not ask for this, and when I indicated I had this certificate, they said that this is not required if you currently hold a valid Texas drivers license. Regarding the skills test, while I haven't yet taken it, the DPS representative indicated that as part of the test, I would first have to test my air brakes to show that they are functioning properly. For the offroad, I would only have to do straight-line backing and not offset backing or parallel parking. I plan to post an update if the skills test is anything different from what she described.